Updated 'Game' class.

Updated the 'Game' class by adding the 'getActivePlayerId' method to it.

Projekte/mdga/model/src/main/java/pp/mdga/game/Game.java

@@ -152,6 +152,16 @@ public Player getPlayerByColor(Color color) {
         return null;
     }
 
+    /**
+     * This method will be used to return the id of the active player depending on the activeColor attribute of Game
+     * class.
+     *
+     * @return the id of the active player as an Integer.
+     */
+    public int getActivePlayerId() {
+        return this.getPlayerIdByColor(this.activeColor);
+    }
+
     /**
      * This method will be used to return the id of the Player defined by the given color parameter.
      *